<!DOCTYPE html>
<style>
    input[type="submit"] {
        display: block;
        width: 100px;
        height: 100px;
        background-color: green;
        outline: none;
        border: 5px solid magenta;
        box-sizing: border-box;
    }
</style>
<input type="submit" value="2" />
<input type="submit" value="3" />
<input type="submit" value="4" />
